Which vs. that

This one can be pretty tricky, but here's how to figure out whether you use which or that. Use that before a restrictive clause and which before everything else. A restrictive clause just means you can't get rid of it because without it, the sentence wouldn't make sense. Here's an example: A dress that is white is usually worn by a bride. If you remove "that is white," the meaning of the sentence would change. Without it, you would be saying a dress is usually worn by a bride, not specifically a white dress.

Here's an example for which: Movies, which are fun to see, are going up in price. If you take out "which are fun to see," the sentence doesn't lose its original meaning. This means that "which are fun to see" is a nonrestrictive clause--it can be left out without changing the meaning of the sentence.